This assembly is from 1957 from a Raytheon manual, but can be modernized using a BC548, 6 V power supply and common 100 mA relays.
In the figure we have the simple way to use a low current switch or sensor to drive a high power...
Found in a 1990s American documentation, this circuit provides an output voltage approximately 4 times...
The presented circuit uses an optocoupler to trigger a triac. We found it in a Popular Electronics from...